BERLIN, July 27 (Reuters) - A second suspect detained in connection with ‌a deadly car-ramming attack ‌on Berlin's Pride celebrations over the weekend has ​been released, the German federal prosecutors' office said on Monday.

"We continue to investigate broadly," the prosecutors' office ‌told Reuters ⁠and declined to comment further.

Spiegel on Monday cited sources ⁠as saying that authorities released the person because initial suspicion that ​he was ​a passenger ​in the vehicle ‌at the time of the attack could not be upheld.

The ramming attack, killing one person, happened in the Tiergarten park near the Brandenburg ‌Gate at about ​10 p.m. (2000 GMT) on ​Saturday, not ​far from annual Christopher ‌Street Day celebrations.

The suspected ​driver, a ​21-year-old man with a record of Islamist extremist activity, was ​shot dead ‌in Berlin on Sunday.

(Reporting by ​Kirsti KnolleWriting by Ludwig BurgerEditing ​by Linda Pasquini)